Jan Chipchase, who works at User Experience Group at Nokia Research, writes:

"I'm surprised no one has tried to brand power sockets in locations like this [airport] - this socket sponsored by 'T-Mobile Wi-Fi access'. Micro targeted advertising should get interesting when it collides with the widespread adoption of IPv6.

Observed power socket clustering to charge mobile phones in a variety of cultures including Hangzhou train station and JFK Airport, below."